Select fatty acids used as substrate and product of D5D and D6D desaturase indices. The * denotes p-values which are significant. P-values were determined using multiple linear regression models which were adjusted for BMI, age, dietary LA, ALA, EPA and DHA, % total energy from dietary fat and physical activity. Caucasian females: n = 298; East Asian Females: n = 277. Abbreviation: SD standard deviation.